Finding the Fourth Proportional to 2,538.82, 3,807.96 and 807.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,538.82 : 3,807.96 = 807.31 : x
2. Step 2: Convert to fraction form
   2,538.82/3,807.96 = 807.31/x
3. Step 3: Cross multiply
   2,538.82x = 3,807.96 × 807.31
4. Step 4: Simplify right side
   2,538.82x = 3,074,204.19
5. Step 5: Solve for x
   x = 3,074,204.19/2,538.82
6. Step 6: Final answer
   x = 1,210.88